Rotary brush



March 28,1944. R PETERSON 2,345,422

ROTARY BRUSH Filed Dec. 13. 1941 2 Sheets-Sheet 1 IN VENTOR'.

BY RUBEN OPETERSON.

March 28, 1944. R. o. PETERSON 2,345,422

ROTARY BRUSH Filed Dec. 13, 1941 2 Sheets-Sheet 2 IxTs-JO INVENTOR.

BY RUBEN O.PETERSON ATTORNEYS Patented Mar. 28, 1944 UNITED STATES PATENT OFFICE ROTARY BRUSH Application December 13, 1941, Serial No. 422,891

13 Claims.

This invention relates, as indicated, to rotary brushes and rotary brush sections, particularly brushes adapted to carry abrasive polishing material.

Various types of cloth-sided brushes have long been employed in the art but have been subject to a number of serious objections. In the first place, the cloth material has tended to rapidly unravel and disintegrate in use even when such sides have been sewn together through the intervening brushing material. Furthermore, abrasive material applied to the brushes has not been retained as well as might be desired. Also there has been a tendency for bristles, such as tampico fiber, which are tightly packed as they leave the brush back to overheat and burn."

It is, therefore, a primary object of this invention to provide a rotary brush having fabric sides, which fabric will not unravel or disintegrate in use but will wear down at a rate commensurate with the brushing material.

Another object of this invention is to provide a rotary brush which is adapted to retain abrasive or polishing material applied thereto.

A further object is to provide such a brush which will be ventilated to prevent overheating and yet be relatively dense at its outer periphery to ensure a solid and efiective brushing surface.

Other objects of this invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain structure embodying the invention such disclosed means constituting, however, but one of various structural forms in which the principle of the invention may be used.

In said annexed drawings:

Fig. 1 is a side elevational view of a preferred embodiment of my invention;

Fig. 2 is a sectional view taken along the line 2-2 on Fig. 1;

Fig. 3 is a sectional view taken along the line 3-3 on Fig. 1;

Fig. 4 is a sectional view taken along the line 4-4 on Fig. 1;

Fig. 5 is an arcuate sectional view taken along the line 5--5 on Fig. 1;

Fig. 6 is a fragmentary side view of another embodiment of my invention showing therela tionship of the various layers'of material;

Fig. 7 is an arcuate sectional view taken along the line 1-1 on Fig. 6;

Fig. 8 is a radial sectional view taken through such a brush section but showing an increased annular opening in the fabric sides to afford ventilation of the brushing material adjacent the brush back;

Fig. 9 is a sectional view taken along the line 99 on Fig. 6; and

Fig. 10 is a fragmentary sectional view of a brush similar to that illustrated in Fig. 1 but showing a slightly difierent type of radial stitchmg.

Referring now more particularly to such drawings, a brush formed in accordance with my invention may comprise an annular channel form brush back I adapted to be carried by an adapter 2 for mounting on an arbor or mandrel. Brushing material such as bristles 3 is held in such brush back by means of a wire retaining ring l. Embracing such brush material are annular sides 5 of sheet material interconnected by radially disposed means such as stitching 6. Such stitching is operative to drawthe aforesaid sides together to form a plurality of pockets, as best shown in Figs. 4 and 5, such pockets being effective to retain powdered abrasive or polishing material.

In the specific form of radially extending stitching 6 illustrated in Fig. 1 (and the same is true of the stitching in the modified construction illustrated in Fig. 6 described below) it will be noted that such stitching is continuous around the entire annular body of brush material which constitutes an individual brush section. In other words, not only is the stitching which forms the successive pockets, into which the brush material is to be divided, in the form of deep scallops, but the latter are interconnected or continuously joined together. Actually the radial lines of stitching are double, as shown not only in the figures cited, but also in Fig. 5, the line of stitch ing being sharply reversed at the outer end of each radius and following a closely parallel path back towards the retaining ring where it is carried circumferentially for a short distance to form the bottom, of the scallop and then runs out radially to the outer edge, back again, and so on all the way around the section.

In another embodiment of my invention, as best shown in Figs. 6 and '7, the brushing material may be radially divided by a plurality of thin sheets I which thus divide the pockets formed by the radial stitching 6 connecting the side sheets 5', as'sh'own in Figi'i. In this form such side sheets are shown as extending to the annular channel back I (see Fig. 9), although they likewise may be cut away to provide for ventilation of the brush material adjacent the brush back, as shown in Fig. 8. Instead of connecting the side sheet material together by means of stitching in the form of deep scallops as illustrated in Figs. 1 and 6, a method which has been found to be very satisfactory and conveniently performed on the usual type of sewing machine, simple radial stitching of the type illus trated in Fig. 10 may alternatively be employed. The brushes of this invention may be formed of a wide variety of brushing material including tampico fiber, sisal fiber, bristlesfsteel wool, bufling cloth, and the like. The provision of a ventilating opening between the sides and'brush back is generally desirable when employing bristle types of brushing material and may be ad vantageous with other materials. a

By sheet material sides or fabric sides it is intended to include any material suitable or customarily employed as siding for rotary brushes or rotary brush sections. Particular reference may be made to cloth Whether braided or woven, textiles generallyfelt, paper and sheets of synthetic material such as Plio filrn or other plastics. v f

While stitching is generally employed as with linen or Pliofilm thread, any'other suitable method may be employed depending upon the siding materials used and the uses to which the finished brush is to be put. Such other means include adhesive and, when certain types of plastic sheet material are employed, simply the application of heat and pressure along radial lines. Radially stitching or otherwise joining the siding material affords several advantages in addition to holding such material together and preventing its disintegration at a rate greater than that at which the brushing material is worn down. As compared to the known method of stitching the sides together with concentric circles of stitches, the method of the present invention permits movement of the bristles relative to each other thereby avoiding unnecessary flexing terior to the brush, and avoiding streaking of the work as was formerly often experienced with cloth-sided rotary brush sections. Where the work is harsh, it is desirable to employ a relatively large'number of narrow tufts, say twentyfour in a brush sixteen inches in diameter. Such brushes often rotate at a rate of 3000 R. P. M. Where the brush is to rotate at. a comparatively slow speed, fourteen orfifteen tufts in a brush of the same diameter may be quite sufficient.

In addition, when employing cloth as the siding material, a plurality of layers may be used with thewarps and woofs staggered to aid in preventing unravelling, and three or more properly oriented layers may previously be sewed or glued together if desired. Furthermore, the fabric may be treated by impregnating with lacquer, glues or drying oils such as linseed oil, to increase resistance to unravelling.

It will be apparent from the foregoing thatfthe objects of my invention have been accomplished by means adaptable to all types of rotary brushes and without the necessity of the employment of expensive machinery or materials.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the structure herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. A rotary brush comprising an annular brush back, brushing material held in said brush back, fabric-sides embracing said brushing material, and a'series of 'circumferentially spaced, radially extending means interconnecting said sides from points adjacent the inner edges to points adjacent the outer edges thereof, said material being unconfined except by said sides and interconnecting means.

2. A rotary brush comprising a circularized brush back, brushing material held in said brush back, fabric sides embracing said brushing material, and a series of circumferentially spaced, radially extending lines of stitching interconnecting said sides from points adjacent the inner edges to points adjacent the outer edges thereof, said material being unconfined except by said sides and stitching.

3. A rotary brush comprising an annular brush back, brushing material held in said brush back, fabric sides embracing said brushing material, and radially extending stitching interconnecting said sides to form a plurality of pockets therebetween, said material being confined in such pockets by said sides and stitching only.

4. A rotary brush section comprising brushing material confined between cloth sides, and a series of circumferentially spaced, radially extending lines of stitching interconnecting such sides from points adjacent the inner edges to points adjacent the outer edges thereof, said material being unconfined except by said sides and stitching.

5. A rotary brush section comprising brushing material confined between paper sides,.and a series of circumferentially spaced, radially extending lines of stitching interconnecting such sides from points adjacent the inner edges'to points adjacent the outer edges thereof, said material being unconfined except by said sides and stitching.

6. A rotary brush section comprising an annular brush back, brushing material held in said brush back, fabric sides embracing said brushing material, and radially extending stitching interconnecting said sides from points adjacent the inner edges to points adjacent the outer edges thereof and efiective to draw said sides together to form a plurality of pockets.

7. A rotary brush section comprising an annular brush back, bristles held in said brush back, fabric sides embracing said bristles, and radially disposed stitching interconnecting said sides from points adjacent the inner edges to points adjacent the outer edges thereof and effective to drawsaid sides together to form a plurality of tufts of said bristles. r r

8. A rotary brush comprising an annular brush back, brushing material held in said brush back, annular fabric sides embracing said brushing material of such dimensions as to expose a portion of said brushing material adjacent said brush back,.and radially disposed stitching inter.-

connecting'said-sides;

9. A rotary brush section comprising an annular brush back, bristles held in said brush back, annular fabric sides embracing said bristles of such dimensions as to expose a portion of said bristles adjacent said brush back, and radially disposed stitching interconnecting said sides and dividing said bristles into tufts.

10. A rotary brush comprising an annular brush back, brushing material held in said brush back, fabric sides embracing said brushing material, and stitching in the form of deep scallops interconnecting said sides from points adjacent the inner edges to points adjacent the outer edges thereof, said material being unconfined except by said sides and stitching.

11. A rotary brush section comprising an annular brush back, bristles held in said brush back, annular fabric sides embracing said bristles of such dimensions as to expose a portion of said bristles adjacent said brush back, and stitching in the form of deep scallops interconnecting said sides from points adjacent the inner edges to points adjacent the outer edges thereof and dividing said bristles into tufts.

12. A rotary brush section comprising brushing material confined between fabric sides, and a series of circumferentially spaced, radially extending lines of stitching interconnecting said sides from points adjacent the inner edges to points adjacent the outer edges thereof, said lines of stitching being doubled at their outer ends and connected to the adjacent line at their inner ends so as to form in effect a continuous line of stitching.

13. A rotary brush section comprising brushing material confined between fabric sides, and stitching in the form of a series of scallops interconnecting said sides from points adjacent the inner edges to circumferentially spaced points adjacent the outer edges thereof, the stitching composing such scallops forming part of a continuous line of stitching.

RUBEN O. PETERSON. 

